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37 Which particle diagram represents a sample of oxygen gas at STP?

August 2019 Regents Chemistry Exam


37 Which particle diagram represents a sample of oxygen gas at STP?


Solution: Oxygen is diatomic (a molecule of oxygen has two oxygen atoms), eliminating choices 1 and 2. It is a gas as stated in the question. Gases are spread out and take the shape of the container.

Answer: 4

PS: To memorize diatomic elements, we can use the mnemonic BrINCl HOF



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